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Leather-like sheet

a technology of leather-like sheets and sheets, applied in the field of leather-like sheets, can solve problems such as fuzz generation, and achieve the effects of excellent supple feeling, excellent surface quality, and excellent bending resistan

Active Publication Date: 2010-03-18
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018]The problem to be solved by the present invention is to provide a leather-like sheet having an excellent surface grade in which fuzz generation is suppressed by decreasing surface tack of a surface skin layer while maintaining an excellent suppleness and bending resistance, especially a good bending resistance in a low-temperature environment.
[0020]Specifically, when a urethane resin that is obtained by reacting polyol containing polytetramethylene glycol and polyisocyanate such as 4,4-diphenylmethanediisocyanate for example is used in the surface skin layer in order to give further suppleness to the urethane resin, a surface skin layer having a supple feeling, a good bending resistance, etc. can be formed.
[0021]However, surface tack can be easily generated on the surface of the surface skin layer that is formed using the urethane resin due to the influence of the polytetramethylene glycol, and as a result, fuzz is generated that is caused by the surface tack when a laminated product of the base material and the surface skin layer are wound in a roll and rested, and then unwound.
[0022]The present inventors considered that such fuzz generation can be suppressed by using a resin that is capable of curing promptly as a resin constituting the surface skin layer, and investigated to use a resin with which an ultraviolet ray curing reaction that generally carries out the curing reaction promptly can be performed besides the moisture curing reaction to form the surface skin layer.
[0025]Because the leather-like sheet according to the present invention has an excellent surface grade by suppressing the fuzz generation on the surface skin layer, and is excellent in supple feeling, durability, and bend resistance, it can be used as an artificial leather and a synthetic leather that are used in manufacturing of shoes such as women's shoes, sport shoes, and sandals, and in furniture, clothes, etc.

Problems solved by technology

However, surface tack can be easily generated on the surface of the surface skin layer that is formed using the urethane resin due to the influence of the polytetramethylene glycol, and as a result, fuzz is generated that is caused by the surface tack when a laminated product of the base material and the surface skin layer are wound in a roll and rested, and then unwound.

Method used

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Examples

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synthesis example 1

[0162]An alkylene oxide adduct of bisphenol A that was obtained by adding 6 mol of propylene oxide into 1 mol of bisphenol A was reacted with sebacic acid and isophthalic acid, and a polyester polyol (I) having a number average molecular weight of 2000 was obtained.

[0163]50 parts by mass of polytetramethylene glycol having a number average molecular weight of 2000 and 50 parts by mass of the polyester polyol (I) that was synthesized above were heated to 120° C. at a reduced pressure in a four-neck flask having a capacity of 1 liter, and it was dehydrated until the moisture ratio became 0.05% by mass.

[0164]Then, 20 parts by mass of 4,4′-diphenylmethanediisocyanate was added into a mixture of the polytetramethylene glycol and the polyester polyol (I) that was cooled to 60° C., 0.01 parts by mass of di-n-butyltindilaurate was further added thereto as a catalyst, and then the temperature was increased to 110° C., the reaction was performed for 5 hours until the content of the isocyanate...

synthesis example 2

[0165]A urethane prepolymer (2) was obtained by adding 0.68 parts by mass of 2-hydroxyethylacrylate and 0.01 parts by mass of tin octylate into 100 parts by mass of the urethane prepolymer (1) that was heated to 110° C. The ratio of the number of the isocyanate groups with which the hydroxyl groups of 2-hydroxyethylacrylate were reacted based on the entire number of the isocyanate groups in the urethane prepolymer (1) ((HEA / NCO)×100) was 10%.

[0166]Here, ((HEA / NCO)×100) of the urethane prepolymer (2) was obtained by the following method. Excessive dibutylamine was added into urethane prepolymer (2), and the isocyanate groups that remained in urethane prepolymer (2) were reacted with dibutylamine. Then, the amount of the isocyanate groups in the urethane prepolymer was calculated by obtaining the amount of the remaining dibutylamine with a back titration method using hydrochloric acid, and ((HEA / NCO)×100) of the urethane prepolymer (2) was calculated. The ((HEA / NCO)×100) of urethane p...

synthesis example 3

[0167]A urethane prepolymer (3) was obtained with the same method as in Synthesis Example 2 except that the amount of 2-hydroxyethylacrylate used was changed to 1.36 parts by mass. The ((HEA / NCO)×100) of the urethane prepolymers (3) was 20%.

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Abstract

A leather-like sheet is provided having a substrate layer and a surface skin layer in which the surface skin layer is composed of a cross-linked product of a polyurethane hot-melt composition containing 100 parts by mass of a urethane prepolymer, 5 parts by mass to 40 parts by mass of a coloring agent containing a polyol, 5 parts by mass to 50 parts by mass of multi-functional (meth)acrylate, and 0.5 parts by mass to 5 parts by mass of a photopolymerization initiator, wherein the urethane prepolymer can be obtained by reacting 5% to 50% of the number of isocyanate groups in a urethane prepolymer containing isocyanate groups that is obtained by reacting a polyol containing 40% by mass or more of polytetramethylene glycol and a polyisocyanate with a (meth)acrylate containing a hydroxyl group. This leather-like sheet has an excellent surface grade while maintaining excellent suppleness and bending resistance.

Description

CROSS REFERENCE TO PRIOR RELATED APPLICATIONS[0001]This application is a U.S. national phase application under 35 U.S.C. §371 of International Patent Application No. PCT / JP2007 / 072356, filed on Nov. 19, 2007, and claims the benefit of Japanese Patent Application No. 2006-325684, filed on Dec. 1, 2006, both of which are incorporated by reference herein. The International Application was published in Japanese on Jun. 5, 2008, as International Publication No. WO 2008 / 065920 A 1 under PCT Article 21(2).FIELD OF THE INVENTION[0002]The present invention relates to a leather-like sheet that can be used in footwear such as women's shoes, sport shoes, and sandals, and in furniture, clothes, etc.BACKGROUND OF THE INVENTION[0003]A leather-like sheet such as an artificial leather and a synthetic leather is used in wide usage such as footwear and clothes. A basic configuration of the leather-like sheet is a layered structure composed of a surface skin layer, an adhesive layer, and a substrate la...

Claims

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Application Information

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IPC IPC(8): B32B5/18C08L75/00C08L63/00B32B27/40
CPCD06N3/0056D06N3/0063D06N3/0065Y10T428/269D06N3/145D06N3/146D06N2211/28D06N3/14Y10T428/31551Y10T428/249988D06N3/08
Inventor KANAGAWA, YOSHINORINIWA, TOSHIOTAMAKI, TOSHIFUMITAKAHASHI, MINORU
Owner DAINIPPON INK & CHEM INC
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